Abstract
Large differences have been observed in the coercivity values of Fe SiO 2 and Fe BN granular films with the coercivities being much lower in the BN matrix. We have used Mössbauer spectroscopy in an attempt to understand the differences in the magnetic hysteresis behavior. The Mössbauer data suggest a core/shell morphology for the Fe SiO 2 films with an Fe(Fe-Si) core surrounded by an Fe-Si-O shell whose surface consists of Fe 2+-Si-O grains. In Fe BN the data indicate the presence of amorphous Fe-B particles in a BN matrix. This hypothesized particle morphology can explain the high coercivity values in SiO 2 films and the low H c in BN because of the low anisotropy of the amorphous phase.
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